172results about How to "No cross-reactivity" patented technology

The invention discloses papillomavirus detection and a typing liquid chip, and a process which is used to the detection and typing papillomavirus. The liquid chip mainly comprises microsphere which is respectively enveloped with specific anti-tag label sequence and 7-10 T spacer arm sequence which is arranged between anti-tag label sequence and microsphere, wherein anti-tag label sequence is chosen from two or more than two sequences in SEQ ID NO. 25- SEQ ID NO.47, specific ASPE primer is respectively designed aiming at each typing HPV, ASPE primer is chosen from two or more than two sequence from SEQ ID NO.1-SEQ ID NO.23, and primer of target sequence which has mutant sites is amplified. The liquid chip improves the current liquid chip technology, which makes ribonucleotide probe microspheres which is prepared be suitable to different detection projects, largely increases fluorescent signal value which is detected, thereby further increasing sensitivity of the detection, strengthening signal-to-noise ratio, and making detection results more accurate and reliable.

The invention discloses a method for detecting diarrhea shellfish toxin, which comprises the following steps: A) establishing a standard curve of depolymerization of okadaic acid (OA) induced HL-7702 hepatocyte F-actin; B) carrying out the calculation on the concentration of the OA according to the standard curve of the F-actin depolymerization of the HL-7702 hepatocyte, establishing a detection method of the hepatocyte F-actin of the diarrhea shellfish toxin to determine the possible detection limit range; C) selecting one or more of components (STX, DA and YTX) which are possibly coexist with the diarrhea shellfish to act on the HL-7702 hepatocyte, determining the specificity of the method for detecting the OA content by detecting the degree of damaging the polymerizing power of the HL-7702 hepatocyte F-actin by the above components. The detection method of the invention has the advantages: (1) taking cells as experimental subjects to avoid the using of experimental animals and conforming to the rule of 3R; (2) having high sensitivity; (3) having good specificity; (4) having good repeatability; and (5) having simple and convenient sample extraction and low matrix effects.

The invention discloses a specific primmer, a liquid phase chip and a detection method for CYP2E1 (Cytochrome P450 2E1) gene SNP (Single Nucleotide Polymorphism) detection. The liquid phase chip comprises wild-type and mutant ASPE (Allele-Specific Primer Extension) primer pairs respectively designed to each type of mutant site, microspheres respectively encapsulated with specific anti-tag sequences, and primers for respectively amplifying a CYP2E1 gene target sequence with G1168A, C1053T and/or G1293C SNP site. The prepared liquid phase chip for CYP2E1 gene SNP detection has excellent signal-to-noise ratio, and the designed probe and the anti-tap sequence do not exit the cross reaction basically. The ASPE primers have excellent specificity and can exactly distinguish all kinds of mutant sites. The detection method has simple steps, the detection of three kinds of SNP bits can be finished once with simple operation, and a plurality of undetermined factors existing in multiple operation processes are avoided, thus the precision rate of the detection can be greatly improved.

A chemical luminous ligand analysis method for quantitatively checking human antibodies belongs to the biomedical technical field, which comprises: using the generality that staphylococcal protein A (SPA) can react with Fc point of IgG in mice; using the monoclonal antibody of high affinity and specificity to prepare a standard product to establish a standard curve; respectively reacting the monoclonal antibody and the antibody in the sample with enzyme-labeled antigens; using the nanometer magnetic particles coated by SPA as ligand to separate solid and liquid; and using enzymatic chemical illumination reaction catalyzed by horseradish peroxidase (HRP) to process illumination check; thereby establishing a chemical luminous ligand quantitative analysis on human antibodies. The chemical luminous ligand analysis method is suitable for quantitatively checking all human antibodies, for resolving the problem of prior art while most human antibodies can not be accurately and quantitatively checked, avoiding cross reaction and avoiding false negative result or false positive result.

The invention discloses a liquid phase chip for detecting gene polymorphism of UGT1A1 and a detection method using the liquid phase chip, the liquid phase chip comprises microspheres respectively enveloped with specific corresponding wide-type and variant-type anti-tag sequences, wherein the anti-tag sequences are selected from the group consisting of SEQ ID NO.13 and SEQ ID NO.14 directed to UGT1A1*28 gene type, SEQ ID NO.9 and SEQ ID NO. 10 directed to UGT1A1*6 gene type, and/or SEQ ID NO.11 and SEQ ID NO.12 directed to UGT1A1*93 gene type; each of the above microspheres includes different color codings, primers including variant target sequences of the UGT1A1*28gene type, the UGT1A1*6 gene type and/or the UGT1A1*93 gene type are amplified, and the primers are modified by biotin so thatthe corresponding PCR reaction product contains a biotin labeling and has a sequence capable of complementary pairing with anti-tag. The matching rate of the detection method provided by the inventionand sequencing method reaches as high as 100%. The prepared liquid phase chip for detecting gene polymorphism of UGT1A1 has quite excellent signal-to-noise ratio and, basically, no cross reaction ispresent between the designed probe and the anti-tag sequence.

The invention discloses a multiple fluorescent quantitative RT-PCR (reverse transcriptase-polymerase chain reaction) method for detecting PRRSV (porcine reproductive and respiratory syndrome virus) and an application thereof. The method is implemented by fluorescent quantitative RT-PCR primers and probes for detecting the PRRSV, wherein the primers comprise an AM-PRRSV primer pair and a TJM-PRRSV primer pair, and the probes comprise an AM-V-PRRSV-P probe, an AM-C-PRRSV-P probe and a TJM-PRRSV-P probe; and the multiple fluorescent quantitative RT-PCR method for detecting the PRRSV comprises the steps as follows: the primers and the probes are utilized to perform fluorescent quantitative RT-PCR amplification, fluorescence signals are collected after the amplification, the fluorescence signals which have amplification curves are positive, and the method is characterized in that an RT-PCR amplification system comprises the primers and the probes. The multiple fluorescent quantitative RT-PCR method can detect and distinguish PRRSV American type classical strains, HP-PRRSV and highly-pathogenic PRRS living-vaccine TJM-F92 strains simultaneously, and has the advantages of high specificity, high sensibility and high degree of automation.

The invention discloses a liquid phase chip for detecting EGFR (epidermal growth factor receptor) gene mutation. The liquid phase chip mainly comprises a wild-type and mutant-type allele specific primer extension (ASPE) primer pair designed for mutational sites of an EGFR gene respectively, microspheres which are respectively coated with specific anti-tag sequences and have different colors of codes and amplification primers for respectively amplifying the target sequences with the corresponding mutational sites of the Exon 19, Exon 20 and/or Exon 21, wherein each ASPE primer comprises the tag sequences at the 5' terminal and the specific primers aiming at the mutational sites of the target gene at the 3' terminal; and the anti-tag sequences can correspondingly complement and form pair with the tag sequences selected in (A). The liquid phase chip has the following advantages: the coincidence rate of the detection method provided by the invention and a sequencing method is as high as 100%; the prepared liquid phase chip has very good signal to noise ratio; and cross reactions do not exist between the designed probes and the anti-tag sequences.

The invention discloses a hepatitis B virus YMDD motif mutation detection specific primer and liquid phase chip and a method thereof. The liquid phase chip mainly comprises an ASPE primer, a microsphere coated with an anti-tag sequence and a primer used for amplifying target sequences having mutation sites of rtL801/V, rtV173L, rtL180M, rtA181V/T, rtM204V/I/S and/or rtN 236T. The detection liquid phase chip and the detection method have high detection sensitivity, high signal-to-noise ratio and more accurate and reliable detection results. Moreover, detecting 6 mutation sites can be completed in the same reaction, i.e., the operation is convenient, and many uncertain factors existing in many times of operational processes are avoided, thereby greatly improving the detection accuracy.

The invention provides a nucleic acid aptamer for detecting clenbuterol hydrochloride. The nucleic acid aptamer is selected from one of following nucleotide sequences shown in SEQ ID NO.1; the nucleicacid aptamers with same lengths are cut from both ends of the nucleotide sequence shown in SEQ ID NO.1, and the cutting length is 1 to 11bp; the nucleic acid aptamers with same cutting lengths of 1 to 11bp at the two ends respectively have the corresponding nucleotide sequences shown in SEQ ID NO.12 to SEQ ID NO.2. The invention also provides a screening method and application of the nucleic acidaptamer. The nucleic acid aptamer has the advantages that the specificity is strong, and the nucleic acid aptamer does not generate crossing reaction with clenbuterol hydrochloride analogues; the affinity is high, and the affinity constant is (42.17+/-8.97) nM; the sensitivity is high; the minimum detection limit of clenbuterol hydrochloride is 1.2ng/mL.

The invention discloses a chemiluminiscence kit for detecting human epididymis secretory protein 4. The kit comprises the human epididymis secretory protein 4, an acridinium ester labeled 69-G10-B8-G8detection antibody and a biotin labeled 9-C3-D12-B1 capture antibody, wherein the acridinium ester labeled 69-G10-B8-G8 detection antibody and the biotin labeled 9-C3-D12-B1 capture antibody are respectively obtained by secreting respective corresponding hybridoma cell strains 69-G10-B8-G8 and 9-C3-D12-B1. The two hybridoma cell strains are obtained by performing recombinant plasmid, protein expression, animal immunization and screening and finally subcloning on an artificially synthesized HE4 gene. The double-antibody sandwich compound disclosed by the invention is good in detection sensitivity and precision, wide in linear range, good in antigen reaction specificity and free of cross reaction.

The invention belongs to the technical field of biological detection, and in particular relates to a primer and a method for detecting CYP2D6 gene polymorphism. The primer for detecting the CYP2D6 gene polymorphism comprises a nested PCR amplification primer and an SNaPshot PCR primer; the nested PCR amplification primer comprises a nested A-turn amplification primer and a nested B-turn amplification primer. The primer for detecting the CYP2D6 gene polymorphism has the advantages of good specificity, no cross reaction and high accuracy, detection of the CYP2D6 gene polymorphism is realized, and the primer has very important significance for realizing gene oriented individualized treatment, continuously improving treatment effects and reducing untoward effects.

The invention discloses a method for efficiently detecting EGFR T790M mutant, a probe and a kit for detection. According to the invention, the method for EGFR mutant capture primer hybridization, mononucleotide extension and DNA linkage is adopted for recognizing the EGFR T790M mutant in a sample, converting the EGFR T790M mutant into a capture sequence containing a mutation site and adopting the specific probe and PCR amplification specific to the mutation site for detecting the capture sequence with the mutation site, thereby detecting the existence of the EGFR T790M mutant in the sample. The invention also provides the probe and the kit for detecting according to the method; the detection according to the invention has the characteristics of high sensitivity, high specificity and simple operation; the method is suitable for the clinical examination of the trace EGFR T790M mutant in a blood sample of a tumor patient; new method and thought are supplied for personalized cancer therapy.

The invention discloses a primer for detecting alcohol metabolizing genes by the aid of pyrosequencing joint sequencing methods, and belongs to the technical field of biological detection. The primer comprises amplification primers shown as SEQ ID NO.1-4 and sequencing primers shown as SEQ ID NO.5-6. Biotin labeling is carried out by 5' ends of the primers shown as SEQ ID NO.1 and SEQ ID NO.3. The invention further discloses application of the primer to simultaneously detecting the polymorphism of SNP (single nucleotide polymorphism) loci rs671 of ALDH2 (acetaldehyde dehydrogenase 2) genes and SNP loci rs1229984 of ADH1B (alcohol dehydrogenase 1B) genes. The primer is high in detection throughput as compared with the traditional ordinary pyrosequencing with only single-SNP polymorphism detection capacity during sequencing reaction in each procedure, the detection time can be effectively shortened, and labor and the cost can be effectively reduced. Besides, the primer and the application have the advantages of accurate detection results, good specificity, high sensitivity, short detection cycle, simplicity in operation and capability of meeting clinical examination requirements.

The invention relates to a porcine circovirus type 2 double antibody sandwich ELISA reagent kit and a detection method. The reagent kit includes an enzyme label plate coated with a monoclonal antibodyagainst a porcine circovirus Cap protein, a blocking buffer, a primary antibody, an enzyme-labeled secondary antibody, concentrated washing liquid, a colored solution, a stopping solution, a standard, a positive contrast, and a negative contrast. The porcine circovirus type 2 double antibody sandwich ELISA has the advantages of short detection cycle, simple operation, high sensitivity, strong specificity and simple equipment requirements and can perform qualitative, semi qualitative and quantitative analysis. Moreover, the reagent kit can achieve rapid detection of large quantities of samples. The invention also provides an application of the reagent kit in detecting an antigen of a porcine circovirus type 2 inactivated vaccine.

The invention belongs to the technical field of biological detection, and provides a primer for simultaneously detecting VKORC1 and CYP2C9 gene polymorphisms. The primer comprises a PCR amplification primer and a SNaPshot PCR primer. The primer can achieve specific detection on VKORC1 and CYP2C9 gene polymorphisms, causes no cross reaction and is good in accuracy.

The invention discloses a colloidal gold immune test strip for detecting tomato brown fruit rugose fruit virus and a preparation method thereof. The test strip is formed by sequentially overlapping and sticking a sample pad, an immune colloidal gold pad, a nitrocellulose membrane and water-absorbing filter paper on a bottom plate. The colloidal gold marked by the anti-ToBRFV monoclonal antibody is coated on the colloidal gold pad, and the other anti-ToBRFV monoclonal antibody and the anti-mouse IgG secondary antibody are respectively coated on a detection (T) line and a control (C) line of the nitrocellulose membrane. The ToBRFV colloidal gold immune test strip disclosed by the invention can be used for accurately, specifically and sensitively detecting the ToBRFV in field tomatoes. According to the test strip, the detection result can be observed by naked eyes within 5 minutes, and the test strip is very suitable for large-batch sample detection in the field, has a very good application value in actual production, and provides material support for diagnosis, monitoring and early warning of ToBRFV.

The invention provides a primer for simultaneously detecting polymorphism of CYP2C*2 and CYP2C*3 genes and belongs to the technical field of biological detection. The primer comprises a PCR amplification primer and a SNaPshot PCR primer. By the adoption of the primer, specific detection of polymorphism of the CYP2C*2 and CYP2C*3 genes can be achieved, cross reaction does not occur, and accuracy is good.